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A localized soft mode model for the nucleation of thermoelastic martensitic transformation: Application to the β → 9r transformation

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Abstract

A nucleation model for bcc → 9R martensitic transformation has been developed based on the experimental data from a Cu-Zn-Al alloy. It has been shown through the third order elastic constants values that the C′ = 1/2(C11 - C12) elastic constant in the bcc phase is very sensitive to the homogeneous {011} (011) shear strains. Consequently it has been demonstrated that, around defects like dislocations, mechanically unstable zones are present where C softens dramatically. The C′ constant is related to the {011} (011) type shear which is precisely the homogeneous lattice strain involved in the bcc → 9R transformation. Nuclei can, therefore, develop in such zones without generating any resistive strain energy. Nucleation is postulated to occur in the zones when the reduced critical nucleus size becomes equal to the unstable zone size.

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Authors and Affiliations

  1. Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, Equipe de Recherche associée au C.N.R. S. no. 463, Institut National des Sciences Appliquées de Lyon—Bât. 502, 69621, Villeurbanne Cedex, France

    G. GuÉnin (Assistant Professor)

  2. E. R. A. 463, I.N.S.A. Bât. 502, 69621, Villeurbanne Cedex, France

    P. F. Gobin (Professor, Director of Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux)

Authors
  1. G. GuÉnin
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  2. P. F. Gobin
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GuÉnin, G., Gobin, P.F. A localized soft mode model for the nucleation of thermoelastic martensitic transformation: Application to the β → 9r transformation. Metall Trans A 13, 1127–1134 (1982). https://doi.org/10.1007/BF02645493

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